The Core Lesson of the COVID-19 Heart Debate

Last Monday, when I called the cardiologist Amy Kontorovich in the late morning, she apologized for sounding tired. “I’ve been in my lab infecting heart cells with SARS-CoV-2 since 6 a.m. this morning,” she said.

That might seem like an odd experiment for a virus that spreads through the air, and primarily infects the lungs and airways. But SARS-CoV-2, the new coronavirus behind the COVID-19 pandemic, can also damage the heart. That much was clear in the early months of the pandemic, when some COVID-19 patients would be hospitalized with...